The Morehead port in North Carolina was shut down and evacuated by officials on Tuesday after nine containers of highly explosive materials were damaged.

There have been no reported injuries or damage to the environment due to the spill which reportedly occurred at around 4:45 a.m. today. People were advised to stay away from the downtown area while emergency management officials cleaned it up.

The accident occurred during a vessel operation at the Port, the North Carolina Ports website said. Details on the circumstances surrounding the accident remain under investigation, the site noted. Hazardous materials are handled routinely at the Port of Morehead City, the port says.

The containers were filled with the explosive compound PETN which is a high explosive organic compound of the same chemical family as nitroglycerin, according to the U.S. Coast Guard, CNN reported.